Add option for extract string array indexes to the variables

Add option for extract string array indexes to the variables. Option name: unknow Enabled by default: IDK, need to test performance after obfuscation

before:

var foo = _0xabc123('0x0');

after:

var _0xcde456 = '0x0';
var foo = _0xabc123(_0xcde456);

Seems it makes it harder to detect _0xabc123('0x0')- like patterns in attempts for automatic deobfuscation.

[BlackYuzia]

Hide this shit - https://github.com/javascript-obfuscator/javascript-obfuscator/issues/806#issuecomment-728152755

[sanex3339]

I haven’t a deobfuscator